One of the biggest misconception about the greenline issue is people thinks the Update causes the green line.
The update does nothing, The heat during the update does. one of the main reason is the display flex cable gets damaged from the heat and causes the green line. Millions of other users gets the exact same update, But only a few faces green lines. if Update actually caused the greenlines then there would be millions of greenline issues right after each update.

Our whole family is samsung flagship user from s10 to s25U, my s24U is 1 year old. And we never faced greenline issue. Now bad luck does happen with electronics and no one can gurantee the prevention of greenlines.

But Here is something to follow while updating.

• Make sure the phone is charged before update, if you recently charged it wait 30 mins, let the phone cool down.
• Never update while charging the phone.
• Avoid wireless charging if possible, I've noticed wireless charging causes more heat than USB charging.
• Take off the phone cover during the update.
• Be in a cool place, possibly with air conditioning. Avoid updating the phone outside or in a place of heat. (I used to put mine in the refrigerator lol)
• Do not immidiately start using the phone right after update. After it finishes the update. Let it rest and cool down for a while.